Air-valve for radiators



(No Model.)

J. P. MARSH.

AIR VALVE FOR RADIAT ORS. N0. $90,244:. Patented Oct. 2, 1888.

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e, which is integrant with the base A.

UNITE STATES PATENT Oriana.

JAMES P. MARSH, OF CHICAGO, ILLINOIS.

AIR-VALVE FOR RADIATORS.

SPECIFICATION forming part of Letters Patent No. 390,244, dated October2, 1888.

Application filed March 6,1888.

To all whom it may concern.-

Be it known that I, JAMES P. llIARSH, of Chicago, in the county of Cookand State of Illinois, have invented certain new and useful Improvementsin Air-Valves for Radiators, of which the following is a full, clear,and exact description, reference being had to the accompanying drawings,forming a part of this specification, in which- Figure 1 is a side viewofmy improved valve as applied to one of the pipes of a radiator. Fig. 2is a central vertical sectional view of said valve. Fig. 3 is a likesectional view showing a modification thereof. Fig. 4 is a bottom viewof the top plate or plug, showing the guiding-prongs thereon; and Fig. 5is a top view of the base, showing the annular socket in which theexpanding material is placed.

Like letters of reference indicate like parts in the different figures.

The object of my invention is to provide an air-valve for radiatorswhich shall be cheap, simple, and compact in its construction, andreliable, durable, and eff'ectivein its operation.

To this end said invention consistsiu certain details of construction,as hereinafter more particularly described, and definitely pointed outin the claims.

Referring to thedrawings, A represents a short cylindrical piece ofmetal, a portion, a, of which is polygonal in form, as shown in Figs. 1and 5. Said portion forms the base of my improved valve, and thecxterioris screwthreaded, as shown at a in Figs. 2 and 3, to receive acorrespondingly-th readed cylindrical shell, B, which is intended toresist the press ore of the expanding material, as well as to form anevaporatirig-chamber, as hereinafter stated. Said base A is preferablyinterior-1y threaded at its lower end, as shown at a", Fig. 2, toreceive aninduction-pipe,0, Fig. 1, which is bent in the form of anelbow and tapped into one of the pipes D of a radiator.

WVithin the shell A, and concentric therewith, is cast or otherwiseformed a tube, E, Figs. 2and 5, extending upwardly from a part, Thus anannular space is formed between the tube E and the body of the shell A.Within said annular space is inserted, preferably by com- Serial No.266,309. (No model.)

pression, a short tube, F, of vuleanite or other analogous compositionor material adapted to be expanded by heat. The bore of the tube F ismade large enough to receive the tube E throughout the length of thelatter, and is then preferably reduced, as shown in Fig. 2, tocorrespond to the interior of the tube E to a point near its top, whenit is again reduced to form a vent, F, Fig. 2.

Soldered or brazed within the cylindrical shell B is a metal plug, G, tothe top of which is secured a plate, G, which, by preference, extendslaterally beyond the circumference of the shell. The plug G is bored andscrewthreaded to receive a screw-valve, H, which is by preferenceprovided with a thumb-piece, h. The top of the expanding tube F forms avalve-seat for said valve, the latter being opposite to and so adjustedas to cover and normally close the vent F. To insure the cen' tering ofthe top of said tube and preserve its axis in alignment with that of thevalve, I form depending spurs {1 upon the plug G, so as to surround theupper end of said tube.

The shell B, when a driptube is not employed, is provided with a seriesof perforations, 6, near its top, and the annular chamber between saidshell and the tube F forms an evaporating-cup for any water which mayescape through the vent, the vapor from which passes off through theperforations b.

By constructing the base in the manner set forth, with the tube E andthe annular space surrounding it, I am enabled to employ a vulcanite orother composition or non-metallic expanding tube the capacity forexpansion of which is much greater than that of metal, thus enabling meto make said valve more con1- pact, it being only about one-thirdthelength of a valve made wholly of metal.

The materials which I. prefer to employ in making said tube in order toobtain the most satisfactory results are as follows: india-rubber orcaoutchouc, (about fifty per cent.,) the usual amou nt of sulphur tovulcanize the same, and plumbago in a suliieient quantity to impartsolidity and wearing qualities thereto. The material described is notonly adapted to expand laterally to an indefinite degree, but, by reasonof such lateral expansion and the qualities of the material socon1bined,the valve seat is not liable to be injured by the pressure ofthe valve thereon in case it is screwed up too tightly, as would be thecase were the tube made of metal. Said tube F, being compressed withinthe annular space around the tube E, when heated fills said space bylateral expansion, so as to insure at all times a stcam-tight joint,which overcomes what would otherwise prove an important Objection to theuse of a non-metallic expansion material. Moreover, in the constructionshown I am enabled to utilize the shell 13 not only as anevaporatingchamber, but as a means for resisting the expansion of thetube F. The guides g serve to insure a perfect seating of the valve,while they permit the free escape of air. I

In Fig. 3 I have shown amodification ofsaid invention. Instead ofconnecting the induction-pipe C, as shown in Fig. 1, it is tapped intothe side of the base A, and a duct, a is formed to communicate with theannular space around the tube F and connect it with a driptube, a". Thevalve H may have a screwtop, and a cap, h, may be provided to protectit.

Having thus described my invention, I claim- 1. In an air-valve, thecombination of the base A, having an interior upwardly-projecting tube,E, integrant and concentric therewith, ,an expansion-tube of vulcaniteor analogous composition, having its base located within the annularspace surrounding said i11- terior tube, a cylindrical shell detachablysecured to said base and inclosing said expan sion-tube, a top plate orplug, G, secured within said shell, and a screw-valve tapped throughsaid plug in operative proximity to the outlet of said expansion-tube,whereby said screw-valve may compress the composition tube into itsannular seat when said tube is expanded, and the lateral expansion ofthe tube may fill said annular space and insure a tight joint,substantially as shown and described.

2. In an air'valve, the combination of the base A, having an interiorupwardly-projecting tube, E, integrant and concentric therewith, anexpansion tube of vulcanite or other analogous composition, having itsbase secured within the annular space surrounding said interior tube, acylindrical shell detaehably secured to said base and inclosing saidexpansion-tube, atop plate or plug,G, secured within said shell, ascrew-valve, H, tapped through said plug in operative proximity to'tlieoutlet of said expansion-tube, and the guideprongs 9, whereby the tubemay be guided and sediment may be expelled therefrom be tween theguide-prongs, substantially as shown and described.

In testimony whereof I have signed this specification, in the presenceof two subscribing witnesses, this 2d day of March, 1888.

JAMES P. MARSH.

\Vitnesses:

D. H. FLETCHER, J. B. HALPENNY.

